Dyestuff solutions of copper phthalocyanine derivatives for paper dyeing

Abstract

Dyestuff solutions of CuPc-(3)(SO.sub.3.sup.⊖ M.sup.⊕).sub.m in which CuPc denotes copper phthalocyanine, m denotes a number from 1.8 to 2.5 and M.sup.⊕ denotes a mixture of A n .sup.⊕ and an amine of the formula ##STR1## in which n represents a number 0.8 to 1.5, A n .sup.⊕ represents an alkali metal ion or NH 4 ion, R 1 and R 2 represent hydrogen, C 1 -C 4 -alkyl or (CH 2 --CH 2 --O) p -H and R 3 represents --(CH 2 --CH 2 --O) p -H, wherein p denotes an integer from 1 to 6, are suitable for dyeing paper in turquoise-colored shades.

We claim: 
     
       1. An aqueous solution of copper phthalocyaninesulphonic acids of the formula   CuPc-(3)(SO.sub.3.sup.⊖ M.sup.⊕).sub.m     in which   CuPc denotes copper phthalocyanine,   m denotes a number from 1.8 to 2.5 and   M.sup.⊕ denotes a mixture of A n .sup.⊕ and an amine of the formula ##STR4##  in which n represents a number 0.8 to 1.5,   A n .sup.⊕ represents an alkali metal ion or NH 4  ion,   R 1  and R 2  represent hydrogen, C 1  -C 4  -alkyl or (CH 2  --CH 2  --O) p  --H and   R 3  represents --(CH 2  --CH 2  --O) p  --H,    wherein   p denotes an integer from 1 to 6.   
     
     
       2. A process for the preparation of copper phthalocyanine sulphonic acid solutions according to claim 1, in which copper phthalocyanine containing 1.8 to 2.5 sulphonic acid groups per molecule, obtained by sulphonation, is discharged in the form of the sulphonation melt into a mixture of ice and water which contains 5 to 100 mols of an alkali metal salt or ammonium salt per mol of sulphonated copper phthalocyanine, the product is filtered off and the filter cake is reacted with water and an amine of the formula ##STR5## wherein R 1 , R 2  and R 3  and p have the meaning indicated in claim 1. 
     
     
       3. The process of dyeing paper pulp or the surface of paper in which the dyestuff solution of claim 1 is used. 
     
     
       4. The aqueous solution of claim 1 consisting essentially of said copper phthalocyanine sulphonic acids, water and up to 10% by weight of organic solvents.